<?php
/**
 * Created by PhpStorm.
 * User: zhenl
 * Date: 2019/9/14
 * Time: 10:24
 */

namespace App\Services\DfChannel;

/**
 * Class CallBackParameter
 *
 * @package App\Service\Channel
 */
class CallBackParameter
{
    public static function load()
    {
        return [
            'out_trade_no',
        ];
    }
}